Polk County is the most densely populated county at 864/sq mi (333.5/km 2), an increase in density from 2010 when it was 655.5/sq mi (253.08/km 2). ) The smallest county (Dickinson) has a land area of 381 sq mi (990 km 2), while the largest (Kossuth) has an area 973 sq mi (2,520 km 2). (The table below shows land area, but the Constitution deals with total area. However, exceptions to this rule were granted, as ten counties have areas below this size. The Iowa Constitution of 1857, which is still in effect today, states that counties must have an area of at least 432 square miles (1,120 km 2), and no county may be reduced below that size by boundary changes. Map of counties numbered as in the National Atlas of the United States One of the most significant days in Iowa county history was January 15, 1851, on which 49 counties were created. Counties continued to be created by the state government until 1857, when the last county, Humboldt County, was created. The south-eastern part of Iowa Territory became Iowa, the 29th state in the union, on 28 December 1846, by which point 44 counties had been created. Two years later, the western portion was split off to become Iowa Territory. In preparation for Michigan's statehood, part of Michigan Territory was formed into Wisconsin Territory in 1836. The first two counties, Des Moines County and Dubuque County, were created in 1834 when Iowa was still part of the Michigan Territory. cities, towns, townships, unincorporated communities, census designated place.
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